Re: transformers versus mtl

On Sun, Mar 22, 2009 at 06:31:08AM -0000, Sittampalam, Ganesh wrote:

Essentially we have the choice of producing full compatibility by keeping the separate type in mtl, in which case State from mtl is not State from transformers, or partial compatibility by re-exporting the transformers one.

Yes, we must choose between full compatibility with mtl and full compatibility with transformers. A quick implementation of the former is http://code.haskell.org/~ross/mtl-compat/ The separate versions of State etc are present, but deprecated.